CA1262673A - Radial tire for truck or bus - Google Patents
Radial tire for truck or busInfo
- Publication number
- CA1262673A CA1262673A CA000509486A CA509486A CA1262673A CA 1262673 A CA1262673 A CA 1262673A CA 000509486 A CA000509486 A CA 000509486A CA 509486 A CA509486 A CA 509486A CA 1262673 A CA1262673 A CA 1262673A
- Authority
- CA
- Canada
- Prior art keywords
- tread
- parts
- auxiliary
- grooves
- longitudinal grooves
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
- B60C11/03—Tread patterns
- B60C11/0306—Patterns comprising block rows or discontinuous ribs
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
- B60C11/03—Tread patterns
- B60C11/11—Tread patterns in which the raised area of the pattern consists only of isolated elements, e.g. blocks
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S152/00—Resilient tires and wheels
- Y10S152/902—Non-directional tread pattern having no circumferential rib and having blocks defined by circumferential grooves and transverse grooves
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Tires In General (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A radial tire for truck or bus eliminate the drawback of shoulder wear and improve the its wet-grip performance; which comprises: a tread part, divided into at least five ribs with at least four circumferentially extending longitudinal grooves;
auxiliary grooves interconnecting the adjacent longitudinal grooves and forming each of the ribs into separated blocks; and the depth of the auxiliary grooves gradually decreasing toward the shoulder part of the tire.
A radial tire for truck or bus eliminate the drawback of shoulder wear and improve the its wet-grip performance; which comprises: a tread part, divided into at least five ribs with at least four circumferentially extending longitudinal grooves;
auxiliary grooves interconnecting the adjacent longitudinal grooves and forming each of the ribs into separated blocks; and the depth of the auxiliary grooves gradually decreasing toward the shoulder part of the tire.
Description
t~;~
-k~ t-T~ S-' ~,.,.~
-~k~ N~ H~ fl~-This invention relates to a pneumatic radi B 1 tire for truck or bus, which mitigate the shoulder wear witbout sacrificing the wet-grip performance.
Generally, the radial tire for use on a truck or a bus i5 provided with a carcass formed of cords which are substantiallY
perpendicularly arranged to the equatorial plane of tire and a steel cord belt layer which are interposed between the carcass and the tread of the tire. Since it excels the bias ply tire in terms of abrasion resistance, puncture resistance, and fuel consumption, it is notably gaining popularity in recent years.
In this radial tire, however, the shoulder parts o~fer lower rigidity than the tread center and are liable to produce more relative motion, since the belt layer of high rigidity is disposed in the crown part of the tire. Such a radial tire suffer from more advanced abrasion against the road surface, Thus, the so-called shoulder abrasion, i.e., a phenomenon that the wear of the tread of tire proceeds more in the shoulder parts than in the tread center, inevitably ensues.
In the meantime, the all-season tire used for travel on wet-roads including snow-covered roads prevalentlY adopts the block tread pattern. Since the block tread pattern, when used in the tire under a heavy load such as of a truck or a bus, offers intolerably low abrasion resistance. Use of the tire incorporating the block tread pattern under such conditions generally proves high uneconomical.
The present invention provides a radial tire which eliminates the drawback of shoulder abrasion lnherent in the con-ventional heavy-duty radial tire and possesses improved grip per-formance on wet road suraces or snow-covered road surfaces.
s According to the present invention -there is provided a radial tire with a tread reinforcing belt for trucks or buses, comprising at least four longitudinal grooves extending circum-ferentially to divide said tread into at leask five parts; auxil-iary grooves extending across said at least five parts of thetread to form at least five rows of circumferentially separated blocks; and the depth of the auxiliary grooves decreasing gradu-ally toward the auxiliary outs~de of the tread so that said rows of separated blocks change into continuous ribs from th~ axially outside to the inside of the tread in sequence as the tread wears. Suitably said auxiliary grooves across the axially outer-most parts of said at least five parts of the tread, are arranged at an angle of 70 to 90 to the circumferential direction of the tire. Desirably said longitudinal grooves extend zig~ag in the same mode and the auxiliary grooves extending betw~en the ad~a-cent longitudinal grooves are arranged zigzag of reverse mode to that of the zigzag of the longitudinal grooves to form a plural-ity of blocks of a diamond shape with their ma~or axes extending circumferentially.
In a particular aspect thereof the present invention provides a radial tire with a tread reinforcing belt for trucks or buses, comprising four longitudinal grooves extending circum-ferentially to divide said tread into five parts including a cen-ter part, two shoulder parts, and two middle parts therebetween;auxiliary grooves extending across said five parts of the tread to form five rows of circumferentially separated blocks; and the ~. ....
depth of said auxiliary grooves satisfying khe followlng relation D4 =D5 < Dl =D 3 < D2 0.2 D0 <D4-D5<0.60 DO
0.40 DO<Dl-D3~0.80 D0 0.60 DO<D2<1.00 DO
where D2 is the depth of the auxlliary grooves extending across said center part, Dl and D3 are the depth of the auxiliary groove exte~dlng across said middle parts, D4 and ~5 are the depth of the auxiliary grooves extending across said shoulder parts, and D0 iS the depth of the longitudinal grooves, whereby said five rows of separated blocks change into continuous ribs ~rom the axially outside to inside of the tread in sequence as the tread wears.
Now, an embodiment of this invention will be described in detail below with reference to the accompanying drawings, in which:-~0 Fig. 1 is a partial plane view showing the tread partof the tire according to this invention;
Fig. 2 is a partial plane view showing the aforemen-tioned tread part after 40% wear; and Fig~ 3 is a partial plane view showing the same treadpart after 60% wear.
In Fig. 1, for zigzag longitudinal grooves ~Gl, G2, G3 and G4) are arranged in the tread part T o~ the radial tire, and each extend in the circumferential direction of the tire. Then, the tread part T is divided into ~ive rlbs ~R1, R2, R3, R4 and RS). In each of the ribs (Rl, R2, R3, R4 and R5), th~ auxiliary grooves ~Ll, L2, L3, L4 and LS ) are formed, so that each of the - 2a -ribs is formed into separated blocks.
The auxiliary grooves L2 situated at the rib R2 are forrned in the greatest depth. The auxiliary grooves (Ll and L3) situated at the ribs (Rl and R3) are formed in a smaller depth than the aforementioned çentral auxiliary grooves L2. The auxiliary grooves (L4 and L5) disposed in the ribs (R4 and R5) 2alling in the shoulder parts are formed at a large angle such as in the range of 70~ to 90 with respect to the circumferential direction of the tire and in a relatively large width such as in the range of 50 to 120~ of the width of the aforementioned longitudinal grooves.
Particularly, the auxiliary grooves (L4 and L5) are formed in a still smaller dePth than the aforementioned auxiliary grooves ~Ll and L3). Thus, the depths (Dl, D2, D3, D4, and D5) of the aforementioned auxiliary grooves (Ll, L2, L3, L4, and L5) satisfy the following relations relative to the average depth D0 of the longitudinal grooves Gl-G4.
0.40 D0 S Dl=D3 ~ 0.80 D0 0.60 D0 ~ D2 _ 1.0 D0 0.20 D0 _ D4=D5 < 0.60 D0 By forming the auxiliary grooves Ll-L5 as described above, the rigidity of the csntral part of the tread part T and the shoulder parts thereof can be balanced. Thus, with use of the tire, the shape of the tread part T varies in proportion to the amount of wear and the resistance of the tread part to shoulder abrasion can be improved in the whole stage of tread wear. The tire, therefore, is enabled to retain the grip performance on wet road surfaces or snow-covered road surfaces. To be specific, in the early stage of wear, after the tread part illustrated in Pig.l has undergone 4~ wear, the auxiliary grooves (L~ and L5) are no longer present as illustrated in Pig. ~. hfter the tread part has undergone 60% wear, the auxiliary grooves ~Ll and L3) are additionally vanish as illustrated in Pig~ 3.
As described above. in the radial tirs of this invention, the rigidity in the central part of the tread is moderated and the rigidity in the shoulder parts is enhanced so much as to preclude tha phenomenon of shoulder abrasion, because the rib pattern incorporating a plurality of longitudinal grooves is designed that the depth of the auxiliary grooves addi-tionallY
formed therein varies in the central part of the tread and in the shoulder parts thereof. ~oreover, the block p3 ttern formed by the aforementioned auxiliary grooves enables the tire to retain its wet-grip performance.
-k~ t-T~ S-' ~,.,.~
-~k~ N~ H~ fl~-This invention relates to a pneumatic radi B 1 tire for truck or bus, which mitigate the shoulder wear witbout sacrificing the wet-grip performance.
Generally, the radial tire for use on a truck or a bus i5 provided with a carcass formed of cords which are substantiallY
perpendicularly arranged to the equatorial plane of tire and a steel cord belt layer which are interposed between the carcass and the tread of the tire. Since it excels the bias ply tire in terms of abrasion resistance, puncture resistance, and fuel consumption, it is notably gaining popularity in recent years.
In this radial tire, however, the shoulder parts o~fer lower rigidity than the tread center and are liable to produce more relative motion, since the belt layer of high rigidity is disposed in the crown part of the tire. Such a radial tire suffer from more advanced abrasion against the road surface, Thus, the so-called shoulder abrasion, i.e., a phenomenon that the wear of the tread of tire proceeds more in the shoulder parts than in the tread center, inevitably ensues.
In the meantime, the all-season tire used for travel on wet-roads including snow-covered roads prevalentlY adopts the block tread pattern. Since the block tread pattern, when used in the tire under a heavy load such as of a truck or a bus, offers intolerably low abrasion resistance. Use of the tire incorporating the block tread pattern under such conditions generally proves high uneconomical.
The present invention provides a radial tire which eliminates the drawback of shoulder abrasion lnherent in the con-ventional heavy-duty radial tire and possesses improved grip per-formance on wet road suraces or snow-covered road surfaces.
s According to the present invention -there is provided a radial tire with a tread reinforcing belt for trucks or buses, comprising at least four longitudinal grooves extending circum-ferentially to divide said tread into at leask five parts; auxil-iary grooves extending across said at least five parts of thetread to form at least five rows of circumferentially separated blocks; and the depth of the auxiliary grooves decreasing gradu-ally toward the auxiliary outs~de of the tread so that said rows of separated blocks change into continuous ribs from th~ axially outside to the inside of the tread in sequence as the tread wears. Suitably said auxiliary grooves across the axially outer-most parts of said at least five parts of the tread, are arranged at an angle of 70 to 90 to the circumferential direction of the tire. Desirably said longitudinal grooves extend zig~ag in the same mode and the auxiliary grooves extending betw~en the ad~a-cent longitudinal grooves are arranged zigzag of reverse mode to that of the zigzag of the longitudinal grooves to form a plural-ity of blocks of a diamond shape with their ma~or axes extending circumferentially.
In a particular aspect thereof the present invention provides a radial tire with a tread reinforcing belt for trucks or buses, comprising four longitudinal grooves extending circum-ferentially to divide said tread into five parts including a cen-ter part, two shoulder parts, and two middle parts therebetween;auxiliary grooves extending across said five parts of the tread to form five rows of circumferentially separated blocks; and the ~. ....
depth of said auxiliary grooves satisfying khe followlng relation D4 =D5 < Dl =D 3 < D2 0.2 D0 <D4-D5<0.60 DO
0.40 DO<Dl-D3~0.80 D0 0.60 DO<D2<1.00 DO
where D2 is the depth of the auxlliary grooves extending across said center part, Dl and D3 are the depth of the auxiliary groove exte~dlng across said middle parts, D4 and ~5 are the depth of the auxiliary grooves extending across said shoulder parts, and D0 iS the depth of the longitudinal grooves, whereby said five rows of separated blocks change into continuous ribs ~rom the axially outside to inside of the tread in sequence as the tread wears.
Now, an embodiment of this invention will be described in detail below with reference to the accompanying drawings, in which:-~0 Fig. 1 is a partial plane view showing the tread partof the tire according to this invention;
Fig. 2 is a partial plane view showing the aforemen-tioned tread part after 40% wear; and Fig~ 3 is a partial plane view showing the same treadpart after 60% wear.
In Fig. 1, for zigzag longitudinal grooves ~Gl, G2, G3 and G4) are arranged in the tread part T o~ the radial tire, and each extend in the circumferential direction of the tire. Then, the tread part T is divided into ~ive rlbs ~R1, R2, R3, R4 and RS). In each of the ribs (Rl, R2, R3, R4 and R5), th~ auxiliary grooves ~Ll, L2, L3, L4 and LS ) are formed, so that each of the - 2a -ribs is formed into separated blocks.
The auxiliary grooves L2 situated at the rib R2 are forrned in the greatest depth. The auxiliary grooves (Ll and L3) situated at the ribs (Rl and R3) are formed in a smaller depth than the aforementioned çentral auxiliary grooves L2. The auxiliary grooves (L4 and L5) disposed in the ribs (R4 and R5) 2alling in the shoulder parts are formed at a large angle such as in the range of 70~ to 90 with respect to the circumferential direction of the tire and in a relatively large width such as in the range of 50 to 120~ of the width of the aforementioned longitudinal grooves.
Particularly, the auxiliary grooves (L4 and L5) are formed in a still smaller dePth than the aforementioned auxiliary grooves ~Ll and L3). Thus, the depths (Dl, D2, D3, D4, and D5) of the aforementioned auxiliary grooves (Ll, L2, L3, L4, and L5) satisfy the following relations relative to the average depth D0 of the longitudinal grooves Gl-G4.
0.40 D0 S Dl=D3 ~ 0.80 D0 0.60 D0 ~ D2 _ 1.0 D0 0.20 D0 _ D4=D5 < 0.60 D0 By forming the auxiliary grooves Ll-L5 as described above, the rigidity of the csntral part of the tread part T and the shoulder parts thereof can be balanced. Thus, with use of the tire, the shape of the tread part T varies in proportion to the amount of wear and the resistance of the tread part to shoulder abrasion can be improved in the whole stage of tread wear. The tire, therefore, is enabled to retain the grip performance on wet road surfaces or snow-covered road surfaces. To be specific, in the early stage of wear, after the tread part illustrated in Pig.l has undergone 4~ wear, the auxiliary grooves (L~ and L5) are no longer present as illustrated in Pig. ~. hfter the tread part has undergone 60% wear, the auxiliary grooves ~Ll and L3) are additionally vanish as illustrated in Pig~ 3.
As described above. in the radial tirs of this invention, the rigidity in the central part of the tread is moderated and the rigidity in the shoulder parts is enhanced so much as to preclude tha phenomenon of shoulder abrasion, because the rib pattern incorporating a plurality of longitudinal grooves is designed that the depth of the auxiliary grooves addi-tionallY
formed therein varies in the central part of the tread and in the shoulder parts thereof. ~oreover, the block p3 ttern formed by the aforementioned auxiliary grooves enables the tire to retain its wet-grip performance.
Claims (6)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A radial tire with a tread reinforcing belt for trucks or buses, comprising at least four longitudinal grooves extending circumferentially to divide said tread into at least five parts; auxiliary grooves extending across said at least five parts of the tread to form at least five rows of circumferen-tially separated blocks; and the depth of the auxiliary grooves decreasing gradually toward the auxiliary outside of the tread so that said rows of separated blocks change into continuous ribs from the axially outside to the inside of the tread in sequence as the tread wears.
2. The radial tire, as claimed in claim 1, wherein said auxiliary grooves across the axially outermost parts of said at least five parts of the tread, are arranged at an angle of 70 to 90° to the circumferential direction of the tire.
3. The radial tire, as claimed in claim 1, wherein said longitudinal grooves extend zigzag in the same mode and the auxiliary grooves extending between the adjacent longitudinal grooves are arranged zigzag of reverse mode to that of the zigzag of the longitudinal grooves to form a plurality of blocks of a diamond shape with their major axes extending circumferentially.
4. A radial tire with a tread reinforcing belt for trucks or buses, comprising four longitudinal grooves extending circumferentially to divide said tread into five parts including a center part, two shoulder parts, and two middle parts therebe-tween; auxiliary grooves extending across said five parts of the tread to form five rows of circumferentially separated blocks;
and the depth of said auxiliary grooves satisfying the following relation D4 =D5<D1=D3<D2 0.2 DO ?D4=D5?0.60 DO
0.40 DO?D1=D3?0.80 DO
0.60 DO?D2?1.00 DO
where D2 is the depth of the auxiliary grooves extending across said center part, D1 and D3 are the depth of the auxiliary groove extending across said middle parts, D4 and D5 are the depth of the auxiliary grooves extending across said shoulder parts, and D0 is the depth of the longitudinal grooves, whereby said give rows of separated blocks change into continuous ribs from the axially outside to inside of the tread in sequence as the tread wears.
and the depth of said auxiliary grooves satisfying the following relation D4 =D5<D1=D3<D2 0.2 DO ?D4=D5?0.60 DO
0.40 DO?D1=D3?0.80 DO
0.60 DO?D2?1.00 DO
where D2 is the depth of the auxiliary grooves extending across said center part, D1 and D3 are the depth of the auxiliary groove extending across said middle parts, D4 and D5 are the depth of the auxiliary grooves extending across said shoulder parts, and D0 is the depth of the longitudinal grooves, whereby said give rows of separated blocks change into continuous ribs from the axially outside to inside of the tread in sequence as the tread wears.
5. The radial tire, as claimed in claim 4, wherein said auxiliary grooves across said shoulder parts are arranged at an angle of 70° to 90° to the circumferential direction of the tire.
6. The radial tire, as claimed in claim 4, wherein said longitudinal grooves extend zigzag in the same mode and the auxiliary grooves extending between the adjacent longitudinal grooves are arranged zigzag of reverse mode to that of the zigzag of the longitudinal grooves to form a plurality of blocks of a diamond shape with their major axes extending circumferentially.
.
.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1985075658U JPS61190704U (en) | 1985-05-21 | 1985-05-21 | |
| JP75658 | 1985-05-21 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1262673A true CA1262673A (en) | 1989-11-07 |
Family
ID=13582550
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000509486A Expired CA1262673A (en) | 1985-05-21 | 1986-05-20 | Radial tire for truck or bus |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US4732195A (en) |
| JP (1) | JPS61190704U (en) |
| AU (1) | AU588317B2 (en) |
| CA (1) | CA1262673A (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61226306A (en) * | 1985-03-30 | 1986-10-08 | Sumitomo Rubber Ind Ltd | High performance tire |
| JPS61235203A (en) * | 1985-04-10 | 1986-10-20 | Sumitomo Rubber Ind Ltd | Radial tire for heavy car with improved comfortableness to drive |
| CA2257612A1 (en) * | 1996-06-07 | 1997-12-11 | The Goodyear Tire & Rubber Company | A convertible tread for a radial truck or trailer tire |
| US6481480B1 (en) | 1996-06-07 | 2002-11-19 | The Goodyear Tire & Rubber Company | Convertible tread for a radial truck or trailer tire |
| USD418458S (en) * | 1998-09-17 | 2000-01-04 | Michelin Recherche Et Technique S.A. | Tire tread |
| JP4583841B2 (en) * | 2004-08-31 | 2010-11-17 | 株式会社ブリヂストン | Pneumatic tire |
| JP2008114738A (en) * | 2006-11-06 | 2008-05-22 | Bridgestone Corp | Tire for heavy load and usage thereof |
| JP5291107B2 (en) * | 2008-08-22 | 2013-09-18 | 株式会社ブリヂストン | tire |
| JP5331462B2 (en) * | 2008-11-27 | 2013-10-30 | 株式会社ブリヂストン | tire |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2076641A5 (en) * | 1970-01-21 | 1971-10-15 | Michelin & Cie | |
| JPS5438005A (en) * | 1977-09-01 | 1979-03-22 | Bridgestone Corp | Pneumatic tire for heavy vehicle |
| CA1104480A (en) * | 1978-02-14 | 1981-07-07 | Harold D. Fetty | Tread for pneumatic tire |
| JPS577706A (en) * | 1980-06-13 | 1982-01-14 | Bridgestone Corp | Pneumatic radial tire for heavy load |
| US4456046A (en) * | 1981-05-11 | 1984-06-26 | Miller Timothy I | High-speed tires |
| GB2142885B (en) * | 1983-07-07 | 1987-05-28 | Dunlop Ltd | Tyre tread |
| US4619300A (en) * | 1983-11-30 | 1986-10-28 | Bridgestone Corporation | Pneumatic tire tread |
-
1985
- 1985-05-21 JP JP1985075658U patent/JPS61190704U/ja active Pending
-
1986
- 1986-05-16 US US06/864,155 patent/US4732195A/en not_active Expired - Fee Related
- 1986-05-19 AU AU57568/86A patent/AU588317B2/en not_active Ceased
- 1986-05-20 CA CA000509486A patent/CA1262673A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61190704U (en) | 1986-11-27 |
| US4732195A (en) | 1988-03-22 |
| AU5756886A (en) | 1986-11-27 |
| AU588317B2 (en) | 1989-09-14 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKLA | Lapsed |